Both the optical disc drives will read ok, but will not write.There is no problem playing a cd,or installing soft ware,but when trying to 'burn' all I get is "no disc in dive" I have tried every type of disc,altered the configuation in 'properties' eg; enable recording and disable UDF Reader.Nothing seems to work.in addition to the no disc message there is a small disc image,flashing besides the cursor arrow.It never recognises a blank disc.I have substituted both drives,with ones that are known to work and changed the hard drive,still no better.So it's obvious there is no problem with the drives,and there is no more options in the properties of each drive.Is there any soution to this problem?